Boot scan results were password protected
this sound like a scan error....avast saying it could not scan the archive bc it was password protected...was that it ?
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if you could post a screen shot of the scan result we may be able to give you more info
Likely to be unable to post a screenshot whilst in the boot-time scan as the software to do it isn't available. Taking a picture of the screen is different, but the easier bet is looking at the boot-time scan report file.
C:\Documents and Settings\All Users\Application Data\AVAST Software\Avast\report\aswBoot.txt XP location.
C:\ProgramData\AVAST Software\Avast\report\aswBoot.txt Vista, win7 location.